Originally posted by clio_usa
You can use on NON-PRODUCTION servers, the V$RECENT_BUCKET view. To enable it, setup DB_BLOCK_LRU_EXTENDED_STATISTICS to nonzero value in init.ora file and enable collection of V$RECENT_BUCKET statistics from V$SYSSTAT.
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Those structures were removed in 8i. You can find the information at:

http://otn.oracle.com/docs/products/...9_mem.htm#5239